Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 28

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The current-voltage graphs for a given metallic wire at two different temperatures $T_{1}$ and $T_{2} (T_{2} > T_{1})$ would be:

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Important Questions on Current Electricity

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 29

For which of the following dependences of drift velocity

v_{d}

on electric field

E

, is Ohm's law obeyed?

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 30

The temperature coefficient of resistance of a wire is

0.00125

per

{}^{\circ}C

. At

300 K

its resistance is

1 Ω

. The resistance of the wire will be

2 Ω

at

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 31

In the figure, a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is:
Question Image

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 32

Carbon resistors, used in electronic circuits are marked for their value of resistance and tolerance by a colour code. A given resistor has colour scheme brown, red, green and gold. Its value in

ohm

is:

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 33

A metallic resistor is connected across a battery. If the number of collisions of the free electrons with the lattice is somehow decreased in the resistor (for example, by cooling it), the current will:

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Complete Study Pack for Engineering Entrances Objective Physics Vol 2>Chapter 2 - Current Electricity>Objective Problems [ Level 1 ]>Q 34

The potential difference between points